Isaiah 56:6-7

6As for foreigners who become followers of the Lord and serve him, who love the name of the Lord and want to be his servants – all who observe the Sabbath and do not defile it, and who are faithful to my covenant –

7I will bring them to my holy mountain; I will make them happy in the temple where people pray to me. Their burnt offerings and sacrifices will be accepted on my altar, for my temple will be known as a temple where all nations may pray.”